<template>
  <div class="create-post-page">
    <h4>新建文章</h4>
    <uploader
      action="/upload"
      class="file-upload-container d-flex align-items-center justify-content-center bg-light text-secondary w-100 my-4"
      :beforeUpload="uploadCheck"
      @file-uploaded="handleFileUploaded"
    >
      <h2>点击上传头图</h2>
      <template #loading>
        <div class="d-flex">
          <div class="spinner-border text-secondary" role="status">
            <span class="visually-hidden">Loading...</span>
          </div>
          <h2>正在上传</h2>
        </div>
      </template>
      <template #uploaded="dataProps">
        <div class="uploaded-area">
          <img :src="dataProps.uploadedData.data.url" />
          <h3>点击重新上传</h3>
        </div>
      </template>
    </uploader>
    <validate-form @form-submit="onFormSubmit">
      <div class="mb-3">
        <label class="form-label">文章标题：</label>
        <validate-input :rules="titleRules" v-model="titleVal" placeholder="请输入文章标题" type="text" />
      </div>
      <div class="mb-3">
        <label class="form-label">文章详情：</label>
        <validate-input rows="10" tag="textarea" placeholder="请输入文章详情" :rules="contentRules" v-model="contentVal" />
      </div>
      <template #submit>
        <button class="btn btn-primary btn-large">发表文章</button>
      </template>
    </validate-form>
  </div>
</template>

<script lang="ts">
import { defineComponent, ref } from 'vue';
import { useRouter } from 'vue-router';
import { useStore } from 'vuex';
import { GlobalDataProps, PostProps, ResponseType, ImageProps } from '../store';
import ValidateInput, { RulesProps } from '../components/ValidateInput.vue';
import ValidateForm from '../components/ValidateForm.vue';
import Uploader from '../components/Uploader.vue';
import createMessage from 'components/createMessage';
import { beforeUploadCheck } from '../helper';

export default defineComponent({
  name: 'CreatePost',
  components: {
    ValidateInput,
    ValidateForm,
    Uploader,
  },
  setup() {
    const store = useStore<GlobalDataProps>();
    const router = useRouter();
    const titleVal = ref('');
    const titleRules: RulesProps = [{ type: 'required', message: '文章标题不能为空' }];
    const contentVal = ref('');
    const contentRules: RulesProps = [{ type: 'required', message: '文章详情不能为空' }];
    let imageId = '';
    const onFormSubmit = (result: boolean) => {
      if (result) {
        const { column, _id } = store.state.user;
        if (column) {
          const newPost: PostProps = {
            title: titleVal.value,
            content: contentVal.value,
            column,
            author: _id,
          };
          if (imageId) {
            newPost.image = imageId;
          }
          store.dispatch('createPost', newPost).then(() => {
            createMessage('文章创建成功', 'success');
            router.push({ name: 'column', params: { id: column } });
          });
        }
      }
    };

    const handleFileUploaded = (rawData: ResponseType<ImageProps>) => {
      if (rawData.data._id) {
        imageId = rawData.data._id;
      }
    };

    const uploadCheck = (file: File) => {
      const result = beforeUploadCheck(file, { format: ['image/jpeg', 'image/png'], size: 1 });
      const { passed, error } = result;
      if (error === 'format') {
        createMessage('上传图片只能是 JPG/PNG 格式!', 'error');
      }
      if (error === 'size') {
        createMessage('上传图片大小不能超过 1Mb', 'error');
      }
      return passed;
    };

    return {
      titleRules,
      titleVal,
      contentVal,
      contentRules,
      onFormSubmit,
      uploadCheck,
      handleFileUploaded,
    };
  },
});
</script>
<style>
.create-post-page .file-upload-container {
  height: 200px;
  cursor: pointer;
  overflow: hidden;
}

.create-post-page .file-upload-container img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.uploaded-area {
  position: relative;
}

.uploaded-area:hover h3 {
  display: block;
}

.uploaded-area h3 {
  display: none;
  position: absolute;
  color: #999;
  text-align: center;
  width: 100%;
  top: 50%;
}
</style>
